Réponse :
Bonjour
Explications étape par étape
Exercice 1
X = 7² -4 X 6 X 10
X = 49 -24 X 10
X = 49 -240
X = -191
Y = 3/4 X 5/3 -1/6
Y = 15/12 -1/6 X 2/2
Y = 15/12 -2/12
Y = 13/12
Z = (3/4 -5/6) : (1 +7/3)
Z = (3/4 X 6/6 -5/6 X 4/4) : ( 1 X 3/3 +7/3)
Z = (18/24 -20/24) : (3/3 +7/3)
Z = -2/24 : 10/3
Z = -2/24 X 3/10
Z = -6/240
Z = -1/40